He said, I believe, "Nature has given me the harsh physiognomy of liberty." There is a certain extent to which Danton overemphasized his own appearance - though it was of course further exaggerated later. Interestingly, the commentary the journal the Révolutions de Paris gives to this speech is that Danton's references to his appearance were out of place and inappropriate. Apparently Robespierre's views on the matter were not unique.